Check-valve



E. S. CHURCH.

CHECK VALVE.

APPLICATION FILED NOV-3,1916.

1,339, 101 en e May 4, 1920.

l likely to be deteriorated by thefiuid passing EDMUND s. CHURCH, or cmcae 'nlmnors.

CHECK-VALVE.

Specification of Letters Patent.

Patented May 4, 1920.

Application filed November 3, 1916. Serial No. 129,267.

To all whom it may concern:

Be it known that LEDMUND S. CHURCH, a

citizen of the United States, and a resident of Chicago, in the county of'Cook and State of Illinois, have invented certain new and useful Improvements in Check-Valves, of which the following is a full, clear, and exact description.

The invention relates to check valves. In many instances, the noise of a check valve is objectionable, for example,in motor vehicles. While this noise can, in some instances, .be overcome bycushionmg material, such as leather or rubber, the use of such material is objectionable because it is through the valve.

One object of the invention is to provide an improved check valve which is substantially noiseless without the use of cushioning means. Another object of theinvention is to provide a check valve which is simple in construction and durable and eflicient in operation. I

The invention consists in the several novel features hereinafter set forth' and more'pa'rticularly defined by claims at the conclusion hereof.

In the drawings: Figure 1 is a section of a check valve embodying the invention. Fig. 2 is a section taken on line 22 of Fig. 1. Fig. 3 is a perspective of the disk valve and the guide tube.

The improved check-valve comprises a casing 5 which is illustrated as connected to the working cylinder A of an explosive engine to permit the escape of a small quantity of fluid under pressure from the cylinder for use in a fuel feeding system. Casing 5 is formed with an inlet duct 6'which is in communication with the combustion chamber of the engine and with a valve seat 7 at the upper end of this .duct. A thin fiat disk 8 of sheet metal serves as a closure or valve which is adapted to close, on the seat 7 and prevent back-flow of'fiuid through the duct 6. A plug 9 is screw-threaded into the casing so that it can be removed. This plug is provided with an integral depending stem 10, the lower end of whichis disposed above and in close proximity to the disk 8 to act as a stop for limiting the movement of thel thin disk away from the valve seat.

chamber 11 is formed in the casing and an outlet pipe 12 is connected to said chamber.

, v A tubular guide 14: for the disk is formed of sheet metal and fits around and is removably held on the stem 10 by a cotter pin 15. Openings 16 are formed in the tubular guide for the passage of fluid from theduct 6 to chamber 11 when the valve is open. The lower end of the tubular guide is turned in- Wardly, as at 17, to underlie the margin of i the disk valve so that when the plug 9 is removed fromv the casing, thedisk will be removed with the plug. When'the plug is removed, the cotter pin will be accessible and the tubular guide may be disconnected from the stemv to permit inspection or re'- placement of the disk.

A characteristic of the invention is the employment of a very thin disk valve which will'be' so light in weight that its impact a ainst the seat and againstv the stem 10 finch arrests its upwardmovement will not result in any audible noise and by thus forming the valve, the use of cushioning material is avoided. Suflicient play is left between the edge of the disk and the tubular guide 14 to permit some lateral play of the disk so that different portions thereof will engage the valve seat. The purpose of this is to prevent the thin metal fromfbeing speedily worn by contact of the same area withthevalve seat. Another feature of the invention consists in employing a tubular guide which can be formed of sheet metal and is secured to the stem of the plug by a cotter pin to facilitate its removaL, The movement of the disk valve between the valve seat and the end of the stem 10 is slight so that it will always be closed against the seat when there is back pressure against it or there is suction in theinlet duct 6.

i In the use of the valve in a. line through which, fluid passes from the cylinder of an explosive engine to a fuel feed, the duct 6 is so small that fire will not pass therethrough and this valve has been found efii- (rient for such use.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I I claim as new and desire to secure by Letters Patent, is: I v

1. In a check valve, the/combination of a casing having a seat therein and inlet and v stem in the casing, a sheet metal tube removably. held on the stem for guiding the" edge of the disk, and a stop ,on the stem to outlet connections for fluid, a valve consisting of a single thin flat metal disk adapted to fit on the seat and a stop to limit and spaced to permit bodily movement of the it disk away from the seat, said disk being so thin and ofsuch light material vthat it will be noiseless when it is rapidly operated between the seat and the stop.

2. In a check valve, the combination of a casinghaving a seat therein and inlet and outlet connections for fluid, a thin fiat disk adapted to fit on the seat, a plug. having a limit the movement-of the disk away from 3. In a check valve, the combination of a casing having a seat therein and inlet and outlet connections for fluid, a thin flat disk adapted to fit on the-seat, a plug having a stem in the casing, asheet metal tube around the stem forvuiding' the edge of the disk,

, a cotter pin or removably connecting the tube to the stem, and a stops-surface on the stem'to limitxthe movement of the valve away from its seat. 3 4. In a check valve, the combination of a casing having. a seat therein and inlet and outlet connections for fluid, a removable plug in thecasing having a stem, a' thinflat disk valve adapted to fiton the seat, and a 5. In a check valve, the combination ofa casing having a seat therein and inlet and outlet connections forfiuid, a thin fiat disk adapted to fit on the seat, a removable plug in the casing having a-stem, a sheet-metal tube around the stem for guiding the edgeof the di sk,a pin. for removably holding the tube on the stem, and a stop-surface on the stem to limit the movement of the valve away from its seat, said tube having open- .ingsfor fluid therein and an inturned' edge a to retain'the disk with the plug when the plug is removed from the casing.

EDMUND S CHURCH. 

